Estrogen deficiency affects bone healing around titanium implants: a histometric study in rats

Area of Science:

• Oral and Maxillofacial Surgery
• Biomaterials Science
• Endocrinology

Background:

• Estrogen deficiency, often seen in postmenopausal women, is linked to reduced bone quality.
• Titanium implants are widely used in dental and orthopedic applications.
• Understanding bone response to implants in estrogen-deficient states is crucial for clinical success.

Purpose of the Study:

• To investigate the effect of an estrogen-deficient state on bone integration with titanium implants in a rat model.
• To assess bone-to-implant contact (BIC), bone area (BA), and bone density (BD) around implants in ovariectomized (OVX) rats compared to controls.

Main Methods:

• Thirty female Wistar rats were divided into ovariectomized (test) and sham-operated (control) groups.
• Titanium implants were surgically placed, and animals were analyzed after 60 days.
• Histomorphometric analysis measured BIC, BA, and BD in cortical and cancellous bone regions. Serum alkaline phosphatase was also measured.

Main Results:

• No significant difference in BIC or BD was found in the cortical bone (zone A).
• Lower bone area (BA) was observed in the cortical bone of OVX rats.
• Estrogen deficiency led to significantly lower BIC, BA, and BD in the cancellous bone (zone B) and higher alkaline phosphatase levels.

Conclusions:

• An estrogen-deficient state adversely affects bone healing and bone density around titanium implants in rats.
• The cancellous bone region appears more sensitive to estrogen deficiency regarding implant integration.
• Findings suggest potential challenges for implant success in estrogen-deficient patients.